IPA: /ˈsɛv.ən.ti.əθ/
KK: /ˈsɛvənˌtiːəθ/
A term used to describe the position of something that is number 70 in a sequence or order.
She finished in seventieth place in the race.
Seventieth is formed from "seven" (from Old English "seofon", meaning the number 7) and "-tieth" (a suffix used to form ordinal numbers). The word "seventieth" refers to the ordinal form of the number seven, indicating the position in a sequence.
Think of the number 'seven' and remember that 'seventieth' means the position of seven in a sequence.
No commonly confused words.